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first thing you should check is the ac adapter, most are made cheaper today,
next is the ac jack in the back, you can take a toothpic or anything to see if the pin moves at all
if it moves just a little , the ac jack could be bad

Is it the Operating System you are trying to install?or the service pack 2 for WinXP?

If it is the OS click on the ASK ME tab under my User ID and leave your contact address, I will send out the 3CD set for compaq Armada/Presario to load the OS and Applications.

If it is the Service pack, don't install SP2, Install SP3 The release candidate 2 is in English, German, or Japanese.Down at the bootom of this link's page, select the language you want and download approx 315mb